Two pipes can fill a tank in 6 hours and 8 hours respectively. A third pipe can empty the same tank in 12 hours. If all the pipes start working together, how long it will take to fill the tank?
Answer & explanation
Correct answer: option 3
The following chart has to be made first:
Efficiency of A = 4
Efficiency of B = 3
Efficiency of Leakage = -2
Efficiency of A + B + Leakage = 5
Thus, it will take 4.8 hours for the cistern to be filled = \(\frac{24 }{ 5}\) = 4.8 hours